html, body, .container {
  height: 100%;
  width: 100%;
}

* {
  margin: 0;
  padding: 0;
}

.img-container {
  //display: -moz-box;
  //display: -webkit-box;
  //display: box;
  display: 'flex';
  padding: 10px;
  box-sizing: border-box;
}

.item {
  //box-flex: 1;
  //-moz-box-flex: 1;
  //-webkit-box-flex: 1;
  box-sizing: border-box;
  margin-top: 20px;
}

.img {
  width: calc(100% - 10px);
  border: 4px solid rgba(117, 117, 117, 0.38);
  border-radius: 4px;
}

@media (min-width: 750px) {
  .img-container {
    padding: 10px;
    box-sizing: border-box;
    width: 100%;
  }

  .item {
    box-sizing: border-box;
    margin-top: 20px;
    width: 50%;
    display: inline-block;
  }

  .img {
    //width: calc(100% - 10px);
    width: 50%;
    border: 4px solid rgba(117, 117, 117, 0.38);
    border-radius: 4px;
  }
}

@media (min-width: 1440px) {
  .img-container {
    padding: 10px;
    box-sizing: border-box;
    width: 100%;
  }

  .item {
    box-sizing: border-box;
    margin-top: 20px;
    width: 30%;
    display: inline-block;
  }

  .img {
    //width: calc(100% - 10px);
    width: 50%;
    border: 4px solid rgba(117, 117, 117, 0.38);
    border-radius: 4px;
  }
}
@media (min-width: 1920px) {
  .img-container {
    padding: 10px;
    box-sizing: border-box;
    width: 100%;
  }

  .item {
    box-sizing: border-box;
    margin-top: 20px;
    width: 25%;
    display: inline-block;
  }

  .img {
    //width: calc(100% - 10px);
    width: 40%;
    border: 4px solid rgba(117, 117, 117, 0.38);
    border-radius: 4px;
  }
}